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Energy Tech Laboratories MR212 - page 1
May 2008 Rev. 11 FOR YOUR SAFETY The use and storage of gasoline or other flammabl e vapors and liquids in open containers in the vicinity of this appliance is hazardous . Standard and Modular Direct Fired Heaters Installation, Operation, and Maintenance Manual Modular Direct Fired Heater Standard Direct Fired Heater Direct Fired Module Save these ...
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Energy Tech Laboratories MR212 - page 2
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Energy Tech Laboratories MR212 - page 3
3 TABLE OF CONTENTS WARRANTY ...................................................................................................................... ............................ 4 INSTALLA TION .................................................................................................................. ........................... 5 Mechanical . ...
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Energy Tech Laboratories MR212 - page 4
4 WARRANTY This equipment is warranted to be free from defe cts in materials and workmanship, unde r normal use and service, for a period of 12 months from date of shipm ent. This warranty shall not apply if: 1. The equipment is not installed by a qualifi ed instal ler per the MANUFA CTURER’S installation instructions shipped with the product, 2. ...
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Energy Tech Laboratories MR212 - page 5
5 INSTALLATION It is imperative that this unit is in stalled and ope rated with the designed airflow, gas, and electrical supply in accordance with this manual. If there are any questions about any items, please call the service department at 1-866-784-6 900 for warranty and technical support issues. Mechanical WARNING: DO NOT RAISE VENTILATOR BY T ...
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Energy Tech Laboratories MR212 - page 6
6 Recom men ded Suppl y Du ctwork Sizes Bl ower Si ze Duct Size St rai ght Duct Lengt h 10 14 x 14 48 i n. 12 16 x 16 54 i n. 15 20 x 20 72 i n. 18 24 x 24 86 i n. 20 26 x 26 108 i n. 25 32 x 32 168 i n. through vertical portion of the ventilator ba se assembly flange using a minimum of eight (8) lug screws, an chor bolt s, or ot her suita ble fast ...
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Energy Tech Laboratories MR212 - page 7
7 Direct Fired Module Installation Indoor (INLINE) Installation Heat Module Add-On Installation Modular heat units shippe d to add heat onto existin g blower only application s require field mechanical and wiring installation. 1. Remove existing filter intake and lifting lugs from blower section in take side. 2. Attach heat module to blower intake ...
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Energy Tech Laboratories MR212 - page 8
8 Gas Pressure Table Gas Pressure Type Gas Pressure Size 1-3 Inlet Pressure 7 in. w.c. – 14 in. w.c. Size 4-5 Inlet Pressure 7 in. w.c. – 5 psi. Max. Manifold Pressure - Natural Gas 5 in. w.c. maximum Max. Manifold Pressure - Propane 2.5 in. w.c. maximum Gas Connection Sizes Unit Size Gas Pipe Size (NPT) Size 1 ¾” Size 2 1” Size 3 1” Siz ...
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Energy Tech Laboratories MR212 - page 9
9 Copper Wire Ampacity Wire Size AWG Maximum Amps 14 20 12 25 10 30 8 40 6 55 4 70 Electrical Before connecting powe r to the heater, read and understand this entire section of this docume n t. As-built wiring diagrams are furnished with each fan b y the factory, and are atta ched to the door of the unit. Electrical wiring and connections should be ...
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Energy Tech Laboratories MR212 - page 10
10 Remote Control Panel On units shipped with the optional remote control panel , an ele ctrical drop containing th e panel wiring is provided with the heate r. There is a terminal strip in side the remote panel th at matches the terminals in the heater unit. The remote panel shoul d be wired as shown below. BL YW RD BK PK RD WH OR BR GY BK RD YW P ...
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Energy Tech Laboratories MR212 - page 11
11 Pilot Assembly OPERATION Prior to starting up or operating the heater, che ck al l fasteners for tightness. In particular, che ck the set screw in the wheel hu b, bearings and t he fan sheaves (pulleys). With power and gas to the heater OFF or prior to connecting ventilator to po wer, turn the fan whee l by ha nd to be sure it is not st riking t ...
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Energy Tech Laboratories MR212 - page 12
12 Maxitrol M511 and M611 Low Fire Bypass Screw Mod Valve Voltage Summary Volts DC Firing Mode 0 to 5 VDC Low Fire 5 to 15 VDC Modulation 15 to 20 VDC High Fire Maxitrol MR212 Lo w Fire Bypass Scre w Average Man ifold Pressure vs. Firing Rate/Ft. of Bu rn er -1.0 0 0.00 1.00 2.00 3.00 4.00 5.00 6.00 0 100000 2000 00 300000 400000 50000 0 600000 Fi ...
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Energy Tech Laboratories MR212 - page 13
13 Adju st pilot flame. Lock u ni t in to hig h f i re. Ad ju s t incomi ng gas pressur e. Doe s h igh fi re pr oduce at least a 70°F temp rise an d produce the correct m anifold pressu re? A djust h igh fire No Lock unit in to low fire. Yes Does thin flame fill ent i re b urne r le ngt h? Adju s t low fire. Sett in g i n comi ng p ressure: Presur ...
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Energy Tech Laboratories MR212 - page 14
14 Maximum RPM and HP Chart Blower Size Maximum RPM Maximum HP 10” 1800 2 12” 1500 3 15” 1400 5 18” 1200 5 20” 1000 10 25” 900 20 Pulley Adjustment Illustration Pulley Setscrew Torque Thread Size Torque (IN/Lb) No. 10 (bushing) 32 1/4” (bushing) 72 5/16” 130 Final Start Up Procedure 1. With the air and burner systems in full operati ...
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Energy Tech Laboratories MR212 - page 15
15 Pulley Combination Chart Motor RPM 1725 1/3 to 1-1/2 H P MOTOR PULL EY Dd1 Dd2 Pd1 Pd2 AX BELTS 1VL34 1.9 2.9 2 3 Open Closed BLOWER PULLEY DATUM DIAMETER PITCH DI A METER 5 4 1/2 4 3 1/2 3 2 1/2 2 1 1/2 1 1/2 0 AK114 11 11.2 308 323 339 354 370 385 400 416 431 447 462 1/3 to 2 HP MOTOR PULL EY Dd1 Dd2 Pd1 Pd2 AX BELTS 1VL40 2.4 3.4 2.6 3.6 Open ...
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Energy Tech Laboratories MR212 - page 16
16 Flame Safety Controller Air Flow Switch DC Flame Signal DC Voltage Flame Status 0 to 5 VDC No Flame 6 to 11 VDC Weak Flame 12 to 18 VDC Strong Flame Sequence of Operation The direct-fired heater is most easily understood wh en broken down into smaller individual system s. There are two main systems, a make -up air fan and a heater. T he make-up ...
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Energy Tech Laboratories MR212 - page 17
17 Maxitrol 14 Amplifier High Temperature Limit airflow switch to close. The high airflo w switch prot ects against profile plate fail ures that cause excessive airflow through the burne r. In the ev ent that the pressure drop across th e burner is not in the range of the airflow switch, gas flow to the burne r is stopped by the Flame Safety Contro ...
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Energy Tech Laboratories MR212 - page 18
18 9 Begins Pilot Trial For Ignition and turns on PTFI LED 9 The pilot g as solenoid valve is opene d, the sp ark igniter begins spar king, and the flamerod sensor watches for flame initiation 9 When flame is establishe d, the FLAME LED is illuminated and m a in valve opens and the FSC powers the Maxitrol system and gas flow begin s modulating 9 Th ...
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Energy Tech Laboratories MR212 - page 19
19 Components The following image and list outlines the typical di rect fired heater components and their fun ctions. 1. Gas Inlet – Main gas supply conn ection 2. Motor Starter – Contactor with overload protec tion to start and prot ect motor. 3. Freeze-Stat Thermosta t (Optional) – De-energizes blo wer motor if the discharge air temperature ...
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Energy Tech Laboratories MR212 - page 20
20 Remote Panel Option The Remote Panel is a device used to control the ope r ation of the heater from a remote location. This unit is available in both a “2 Position” or “3 Position ” configuration and with or with out a cooling output. It also will accommodate both the Maxitrol discharge te mperature dial and the Maxitrol space sensing Se ...
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Energy Tech Laboratories MR212 - page 21
21 Troubleshooting The following tables list cause s and corrective actions for possibl e problems wit h direct fired heater units. Review these lists prior to consulting manufa cturer. Airflow Troubleshooting Chart Problem Potential Cause Corrective Action Fan Inoperative Blown fuse or open circuit breaker Replace fus e or reset circuit breaker an ...
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Energy Tech Laboratories MR212 - page 22
22 Burner Troubleshooting Chart Problem Potential Cause Corrective Action Pilot Does Not Light/Stay Lit Main gas if off Open main gas valve Air in gas line Purge gas line Dirt in pilot orifice Clean orifice with compressed air Gas pressure out of range Adju st to proper gas pressure Pilot valve is off Turn pilot valve on Pilot orifice fitting leak ...
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Energy Tech Laboratories MR212 - page 23
23 Remote Panel Troubleshooting Chart Light Indication Condition Possible Cause No Lights Power not available to Remote Panel Bad voltage to unit Main disconnect i n “OFF” Position Circuit breaker tripped Bad main transformer POWER Light Only Proper unit Off Operation No problem No power to motor starter Manual /Off/Auto Switch in “Off” Pos ...
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Energy Tech Laboratories MR212 - page 24
24 Is Freeze-Stat open? Adjust or Replace Is end switch on Moto ri ze d Damp er closed? Adjust or Replace actuator YES YES NO Nothing Happe ns Is Overload tripped on starter? Reset & m easure FLA of m otor. Is it higher than rating? Adjust or change Pull ey NO NO YES Blower runs but there is no heat Is the air fl ow LED on Flame Saftey ill umin ...
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Energy Tech Laboratories MR212 - page 25
25 MAINTENANCE To guarantee trouble fre e operation of this heater, th e man ufacturer sugge sts following these guid elines. Most problems associated with fan failures are directly related to poor servi ce and maintenance. Please record any mainte nance or service performe d on this fan in the docum ent ation section located at the end of this man ...
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Energy Tech Laboratories MR212 - page 26
26 Burner Orifice Drill Size Orifice Drill Size Gas Port 31 Air Port 43 2 weeks after startup 1. Belt tension should be checked after the first 2 weeks of fan ope ration. Belts tend to stretch and settle into pulleys after an in itial start-up sequence. Do not tension bel ts by changing the setting of the motor pulley , this will change the fan spe ...
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Energy Tech Laboratories MR212 - page 27
27 ...
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Energy Tech Laboratories MR212 - page 28
May 2008 Rev. 11 28 Start-Up and Maintenance Documentation START-UP AND MEASUREMENTS SHOULD BE PERFORMED AFTER THE SYSTEM HAS BEEN AIR BALANCED AND WITH TH E HEAT ON (Warranty will be void without completion of this form) Job Information Job Name Service Company Address Address City City State State Zip Zip Phone Number Phone Number Fax Number Fax ...
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